Quote Originally Posted by FoSHO99 View Post
Site your sources before "correcting" someone. Pure ethanol is 113 octane, I see this "96" going around with no actual data/proof. Are you talking about the RODN number? Gas stations are required to post a minimum octane rating, year around this changes so that's why it says "105 minimum." There are hundreds of articles and tests out there that suggest ranges from 90 to 110 and depending on what area or what exact blend you are using it could be anywhere between those.
where is your source saying pure ethanol is 113?

The AKI scale is what Canada/US uses... which is (RON/MON) x 2= AKI

the scale that says e85 is ~105 is just the RON scale which is not what the states uses...

Octane rating - Wikipedia, the free encyclopedia (not the only source just the quickest on to get to)

"There is no requirement to post octane on an E85 dispenser. If a retailer chooses to post octane, they should be aware that the often cited 105 octane is incorrect. This number was derived by using ethanol’s blending octane value in gasoline. This is not the proper way to calculate the octane of E85. Ethanol’s true octane value should be used to calculate E85’s octane value. This results in an octane range of 94-96 (R+M)/2. These calculations have been confirmed by actual-octane engine tests."